I'm waiting for the tech guru at Crucible to call me with some in-depth info.
After a little thought, I think I will use some of the Parks #50 - which is a fast oil - but rather than heat it to 120-130, I believe I will leave it at room temp to start, and then warm up 10 degrees at a time until, well, until.
The alloy content suggests a deep hardening steel, which normally takes 8-10 seconds to set-up, but the suggested procedure recommends treating it like W2 or 52100??! That doesn't make sense to me, because I would treat W2 and 52100 differently. W2 is shallow hardening and 52100 is deep hardening.
I'll know more tomorrow which willbe good as that's when I get my steel!